UAD Powered Plug-Ins Manual - 466 - Chapter 46: Precision Multiband
COMPRESS
When a band is set to Compress, the dynamic range of the band will be re-
duced (dependent upon the band threshold and input level). This is the typical
value in multiband compression.
EXPAND
When a band is set to Expand, the dynamic range of the band will be in-
creased (dependent upon the band threshold and input level).
GATE
When a band is set to Gate, the band behaves as a gate. A gate stops the
signal from passing when the signal level drops below the specified threshold
value.
Gates are generally used to reduce noise levels by eliminating the noise floor
when the ‘main’ signal is not present, but they are also useful for special ef-
fects.
Threshold This parameter determines the threshold level for compression/expan-
sion/gating. Any signals that exceed this level are processed. Signals below
the level are unaffected. A Threshold of 0 dB yields no processing. The avail-
able range is –60 dB to 0 dB.
As the Threshold control is decreased and more processing occurs, output
level is typically reduced (compression) or increased (expansion). Adjust the
Gain control to modify the output of the band to compensate if desired.
Ratio Ratio determines the amount of gain reduction (or expansion) for the band.
For example: When a band is set to Compress, a value of 2 (expressed as a
2:1 ratio) reduces the signal by half, with an input signal of 20 dB being re-
duced to 10 dB.
The available range depends on the value of the Type parameter, as follows:
• Ratio range in Compress mode is 1:1 to 60:1
• Ratio range in Expand mode is 1:1 to 1:4
• Ratio range in Gate mode is 1:1 to 8:1
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